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    <h3>操作说明：wasd上左下右，space射击，enter开始游戏；</h3>
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  <canvas id="cal1" width="384px" height="384px"></canvas>
  <h3>你还须要干掉敌人数：<span class="number1"></span></h3>
  <h3>剩余生命：<span class="number2"></span></h3>
  <audio src="audio/start.mp3" id="au1"></audio>
  <audio src="audio/attack.mp3" id="au2"></audio>
  <audio src="audio/tankCrack.mp3" id="au3"></audio>
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